Honey bee workers start to build the comb from the top wall of the nest cavity. The series of lines indicate amount of comb build during consecutive 24 hours periods. After Darchen (1968, fig. 100) Le travail de la cire et la construction dans la ruche,
Traité de biologie de l'abeille
, Paris, p.241-331, (1968)
[1] (scale bar = 1 cm)

Comb building occurs also during night Busy bees need rest, too,
Journal of Comparative physiology A
, Volume 163, Number 5, p.565–584, (1988)
[2]. Workers building combs have relatively high body temperature Busy bees need rest, too,
Journal of Comparative physiology A
, Volume 163, Number 5, p.565–584, (1988)
[2].